The Ohm matching game

[Raphaz]

I

Nothing has changed when you asked a variation of the same question a few weeks ago in your other thread post #63

Upgrading from KEF Q500

That’s what I do already. Thank you.

audiokarma.org

Try not to over think this, about a year or so ago there was a newer member and despite all the great explanations, info etc he was adamant that he needed to have specifically a 6ohm receiver.

My understanding is there are very few amps/receivers that were specifically designed as only a "4 Ohm" amp or "6 Ohm" receiver.

As you're already aware of per post #64 in the above mentioned thread A lot of manufacturers would note in their manuals, usually under "Power Output" what they're were rated at for say Primarily 8ohms and 4ohms

I know. At some point I just have to pull the trigger and get some speakers that seem convincing to me. I just wanted to be as informed as possible as I may not be able to test listen in advance).

 

[Raphaz]

Nothing has changed when you asked a variation of the same question a few weeks ago in your other thread post #63

Upgrading from KEF Q500

That’s what I do already. Thank you.

audiokarma.org

Try not to over think this, about a year or so ago there was a newer member and despite all the great explanations, info etc he was adamant that he needed to have specifically a 6ohm receiver.

My understanding is there are very few amps/receivers that were specifically designed as only a "4 Ohm" amp or "6 Ohm" receiver.

As you're already aware of per post #64 in the above mentioned thread A lot of manufacturers would note in their manuals, usually under "Power Output" what they're were rated at for say Primarily 8ohms and 4ohms

I know. Just wanted to be as informed as possible before I pull the trigger on something that I most likely can’t test listen before I buy it.

 

[Raphaz]

I wouldn’t mind a good deal for a CR-2040 in good shape. It’s been on my radar for a while. It’s an outstanding receiver, looks great, has meters and maintenance should be easier. I’d be sacrificing power and headroom, though, it’s hard to beat that X-Processor. Also, I’m suspicious that I’d prefer the sound of the R-2000 slightly over the CR-2040 (I imagine the latter to sound a tad warmer, a bit more tube-like when compared, but I could be wrong, I haven’t heard one yet).

For now I’ll get the R-2000 repaired again and hope that it’ll hold up for a bit longer.

Doesn’t belong in this thread but since it came up: Are there some simple moves worth the investment/time to improve the reliability of the R-2000 so that it requires less repair and maintenance? Is there a substitute for the STKs? Better heatsink? Better transformers, capacitors, speaker terminals? What should I ask my repair/service guy to look into (that he hasn’t already)?

It turns out that it was indeed the STK that failed again. From a quick search and from what my repair guy is telling me, I gather that the STK cannot be substituted with something more reliable. I'll be lucky if we can find an original in good shape. Fingers crossed.

 

[Old Guy8]

If the same part in your Amp has failed a second time. I guess I would wonder why. Design flaw, part quality issue or something else causing its failure. And maybe move on to something else. My 2¢ only.

As to speaker impedance ratings. I believe most speaker's impedance vary at different frequencies. It's not a constant. Some speakers can vary a lot. And can put an extra load on amplifiers, if it drops low enough.